These great hollow globes of artificial super-metals, and artificial transparent adamant, ranged in size from the earliest and smallest structures, which were no bigger than a very small asteroid, to spheres considerably larger than the Earth. (Olaf Stapledon, STAR MAKER)
Monday, August 19, 2019
Not a Saucer
Today's Astronomy Picture of the Day shows a...saucer? No, lenticular clouds over Mount Etna, lit by both the fires of the volcano and the reflected light of the Moon.